HCC4047BF STMICROELECTRONICS [STMicroelectronics], HCC4047BF Datasheet - Page 8

• Manufacturer Part Number: HCC4047BF
• Description: LOW-POWELOW-POWER MONOSTABLE/ASTABLE MULTIVIBRATOR
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

HCC/HCF4047B
ASTABLE MODE WAVEFORMS.
Typ : V
Min : V
Max : V
thus if
ation will be (+ 5.0%, – 0.0%)
In addition to variations from unit-to-unit, the astable
MONOSTABLE WAVEFORMS.
Where t
for t
Typ : V
Min : V
Max : V
Thus if t
ation will be (+ 9.3%, – 0.0%).
Note : In the astable mode, the first positive half
In addition to variations from unit to unit, the mono-
stable pulse width may vary as a function of fre-
quency with respect to V
4 - RETRIGGER MODE
The HCC/HCF4047B can be used in the retrigger
8/15
M
are as follows :
TR
TR
TR
TR
TR
TR
cycle has a duration of T
ations are t
M
t
A
M
= 0.33 V
= 0.33 V
= 0.5 V
= monostable mode pulse width. Values
= 0.5
= 0.67 V
= 0.67 V
= 4.40 RC
= 2.48 RC is used, the maximum vari-
V
DD
DD
DD
DD
DD
A
DD
/2.
t
t
A
A
t
A
t
t
t
is used, the maximum vari-
= 4.40 RC
= 4.62 RC
M
M
M
= 4.62 RC
DD
= 2.71 RC
= 2.48 RC
= 2.48 RC
and temperature.
M
; succeeding dur-
t
t
t
t
t
t
1
2
M
1
2
A
= – RC In
= – RC In
= (t
= – RC In
= – RC In
= 2 (t
period may vary as a function of frequency with re-
spect to V
3 - MONOSTABLE MODE
The following analysis presents worst-case vari-
ations from unit-to-unit as a function of transfer-volt-
age (V
(monostable) operation.
mode to extend the output-pulse duration, or to com-
pare the frequency of an input signal with that of the
internal oscillator. In the retrigger mode the input
pulse is applied to terminals 8 and 12, and the output
is taken from terminal 10 or 11. As shown in fig. A
normal monostable action is obtained when one re-
trigger pulse is applied. Extended pulse duration is
obtained when more than one pulse is applied. For
two input pulses, t
two pulses, t
variable time t
trigger pulse. t
PUT) terminates after the second positive edge of
the oscillator output appears at flip-flop 4 (see logic
diagram).
1
+ t
1
+ t
2
TR
) = – RC In
2
) shift (33% – 67% V
DD
) = –2 RC In
and temperature.
2 V
RE
V
2 V
V
D
2 V
V
D
DD
DD
V
DD
V
after the termination of the last re-
DD
(Q OUTPUT) terminates at some
TR
is variable because t
DD
TR
DD
RE
+ V
– V
– V
– V
– V
= t
TR
TR
TR
(V
TR
TR
1
’ + t
DD
(2 V
(V
(V
+ V
1
TR
DD
TR
+ 2t
TR
) (V
) (V
– V
DD
) (2 V
2
. For more than
DD
DD
) for one-shot
TR
) (2 V
– V
RE
– V
DD
TR
(Q OUT-
TR
– V
DD
)
)
TR
)
)